[Downloaded free from http://www.eoj.eg.net on Thursday, January 21, 2021, IP: 197.62.171.154] 154 Original article Conversion total knee arthroplasty after arthrodesis using rotatory hinge revision system Haytham Abdelazima, Mohammed H. Hashemb aDepartment of Orthopedic Surgery, Ain Shams Objective b University, Cairo, Department of Orthopedic Patients with knee arthrodesis experience many daily activities and limitations Surgery, Helwan University, Helwan, Egypt affecting their life quality. The purpose of this study was to report and discuss the Correspondence to Mohammed H. Hashem, outcome of our cases of knee arthrodesis converted to total knee arthroplasty. MD, 12 Abo El Sououd Sreet, Newnozha, Patients and methods Cairo, 11843, Egypt. Tel: +20 100 580 1143; e-mail: [email protected] In the period from August 2015 to December 2017, the authors conducted a prospective study that included six patients (one female and five males) with Received: 24 September 2019 sound knee arthrodesis. All patients underwent conversion total knee Revised: 2 October 2019 ’ Accepted: 14 October 2019 arthroplasty using rotatory hinge revision system. Patients ages ranged from 35 Published: 18 August 2020 to 66 years. Patients were evaluated using Knee Society Clinical Score and Knee Injury and Osteoarthritis Outcome Score. The Egyptian Orthopaedic Journal 2019, 54:154–160 Results The average follow-up period was 24.5 months (18–36 months). At the final follow- up, average knee flexion was 87.5° (70°–100°). Knee Society Clinical Score and Knee Injury and Osteoarthritis Outcome Score score increased form an average of 31.8 (28.4–34.8) preoperatively to 66.6 (58.6–74.4) at the final follow-up. The authors had an average final Knee society score of 67.6, ranging from 53 to 78. Three cases experienced postoperative complications, representing 50% of the study group, two cases had superficial wound infection, and a case had skin edge necrosis; all were successfully managed, with no long-term complications. Conclusion Conversion total knee arthroplasty is a hope for patients who cannot tolerate the effect of knee arthrodesis in their lives. Awareness of the risks, proper patient selection, good preoperative planning, and adequate management of complications can help the patients to have satisfactory results. Keywords: knee fusion, conversion, rotatory hinge, total knee arthroplasty Egypt Orthop J 54:154–160 © 2020 The Egyptian Orthopaedic Journal 1110-1148 With an arthrodesed knee, the patient must do Introduction excessive hiking of the ipsilateral hip while walking; Knee arthrodesis has been performed since the early this requires more energy, decreasing the patient’s 1900s [1]. Its main indications were to treat endurance and causing low back pain. Moreover, tuberculosis of the knee, severe osteoarthritis, and owing to the absence of the buffering effect of a juvenile arthritis of the knee [2]. Nowadays, knee mobile knee, the ipsilateral hip can be easily arthrodesis is still a treatment option as a limb subjected to be damaged by the direct impact [5] salvage procedure. It can be used as a treatment (Fig. 1). option in cases of failed total knee arthroplasty, periarticular neoplasm, unreconstructable post- For those patients who can no longer tolerate the traumatic arthritis, and chronic infection [3]. aforementioned obstacles, the only hope is to regain some knee motion. This can be tried by taking down The goals of a successful arthrodesis are to achieve the arthrodesis and applying a total knee prosthesis. knee stability and pain relief, leading to enhanced Although a high incidence of complication is reported patient mobility [2]. Nevertheless, even with a after conversion arthroplasty of a sound knee sound uncomplicated arthrodesis, patients arthrodesis (3), new advancements in prosthetic experience functional disability that cannot be tolerated by many of them. Daily activities such as sitting down, using high stairs, using public This is an open access journal, and articles are distributed under the terms transportation, and shutting the door while using a of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work small restroom may be difficult or even sometimes non-commercially, as long as appropriate credit is given and the new impossible [4]. creations are licensed under the identical terms. © 2020 The Egyptian Orthopaedic Journal | Published by Wolters Kluwer - Medknow DOI: 10.4103/eoj.eoj_43_19 [Downloaded free from http://www.eoj.eg.net on Thursday, January 21, 2021, IP: 197.62.171.154] Conversion total knee arthroplasty after arthrodesis Abdelazim and Hashem 155 Figure 1 Figure 3 Incision over the old scar. Left hip osteoarthritis in a case with left knee arthrodesis. Inclusion criteria Patients with sound arthrodesis but the immobile joint Figure 2 negatively affecting their lifestyle and willing to undergo the operation after understanding its risks were included. All our six patients considered undergoing the conversion arthroplasty because they could not tolerate the daily life limitations which the immobile knee dictated on them. Exclusion criteria The following were the exclusion criteria: (1) Active acute, subacute, or chronic infection. (2) Patellectomy. (3) Quadriceps femoris muscle deficiency. (4) Bad skin condition. Anteroposterior and lateral views of the knee. (5) General condition problems, making the patient unfit for anesthesia. design and the surgical techniques may carry a hope for those patients. Preoperative evaluation was done for all patients, including full history taking, physical examination, and radiological examination. Physical examination Patients and methods included soft tissues evaluation and examining In the period between August 2015 and December quadriceps femoris muscle (rectus femoris is tested 2017, a prospective study was conducted involving during active hip flexion, rest of the muscle is tested six cases (one female and five males). Patients were for tone, consistency, and static contractility). referred from orthopedic surgery outpatient clinic Radiological examination included anteroposterior experiencing complications after undergoing knee and lateral views of the knee (Fig. 2). Laboratory arthrodesis. This study was approved by the Ethics tests included routine preoperative investigations Committee of the department of Orthopedic plus acute phase reactants to detect possibility of surgery, Faculty of Medicine, Ain Shams occult infection. University. An informed consent was taken from each patient after Median patients’ age was 50 (35–66) years. The discussing the procedure, the possible risks and indications for the arthrodesis were complications complications, the expected outcomes, and the after various fractures in three patients, rheumatoid rehabilitation program. arthritis in two, and one case of tuberculous arthritis. The median period between arthrodesis Incision over the old scar was used for all patients to and conversion arthroplasty was 3.5 years (1.5–7 minimize tissue damage (Fig. 3). Tibial tuberosity years). osteotomy was performed (Fig. 4), which was later [Downloaded free from http://www.eoj.eg.net on Thursday, January 21, 2021, IP: 197.62.171.154] 156 The Egyptian Orthopaedic Journal, Vol. 54 No. 2, April-June 2019 Figure 4 Figure 5 Tibial tuberosity osteotomy. fixed back in place by two cancellous screws. In cases where patella was found to be fused to the femur, an oscillating saw was used to separate it. Three of the six patients still had the implants used for arthrodesis; for these patients, the implant was removed (Fig. 5). Fusion using an intramedullary nail. The level and direction of the osteotomy were determined under image intensifier guidance, being 2.5 cm inferior to the lateral femoral epicondyle, 2.7 cm Figure 6 inferior to the medial femoral epicondyle, and transverse to the long axis of the tibia (3,6) (Fig. 6). Double-level fusion osteotomy was performed guided by the smallest gap spacer taking meticulous care to preserve soft tissue and bone stock (Fig. 7). The osteotomy was carried out using an oscillating saw till reaching the posterior cortex, and then the posterior cortex is removed by a rongeur in piecemeal fashion to avoid injury to the posterior vascular structures. All of the arthrodesis we converted were well aligned, so we had no troubles dealing with common peroneal nerve tractional injuries after correction of a valgus fixed arthrodesis. Medial and lateral collateral ligaments were examined, especially the medial collateral ligament, being the most important for stability [6]. In all our patients, we used rotatory hinge revision arthroplasty system (NexGen RH Knee Zimmer Inc., Warsaw, Indiana, USA) to avoid instability owing to insufficient ligamentous stabilizers. Image intensifier guidance. Once osteotomy was complete, gradual knee flexion became possible followed by removal of the osteotomy incision was made at the musculotendinous junction of segment. Conventional femoral and tibial side the quadriceps, and then knee was flexed to 45° and the preparation was followed, and then trial reduction tendon was then sutured as Y shape (Fig. 8). was performed with temporal fixation of the previously osteotomized tibial tuberosity to its place. Tibial tuberosity was securely fixed in place (Fig. 9); Flexion range was then examined. In all the patients, closed suction drainage was used for all patients and we encountered tight quadriceps femoris, so V-Y removed